CN103953921B - Oxygen-enriched combustion boiler system and operation method thereof - Google Patents
Oxygen-enriched combustion boiler system and operation method thereof Download PDFInfo
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- CN103953921B CN103953921B CN201410161979.0A CN201410161979A CN103953921B CN 103953921 B CN103953921 B CN 103953921B CN 201410161979 A CN201410161979 A CN 201410161979A CN 103953921 B CN103953921 B CN 103953921B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention discloses an oxygen-enriched combustion boiler system and an operation method thereof. The oxygen-enriched combustion boiler system is capable of meeting the emission standard and retarding device corrosion. A denitration device is arranged between a tail part flue of the oxygen-enriched combustion boiler system and a preheater; a heat radiation smoke outlet of the preheater is connected with a heat radiation smoke inlet of a smoke heat exchanger through a dust remover; a heat radiation smoke outlet of the smoke heat exchanger is connected with a desulfurization device and a smoke cooler in sequence and is then returned to a heat absorption smoke inlet of the smoke heat exchanger; a part of the primary air of a combustor is fed into the combustor through a primary air oxygen injector after passing through the preheater and the rest part of the primary air of the combustor is used for pulverizing; the secondary air of the combustor enters the preheater through a secondary air oxygen injector and then is fed into the combustor. The operation method of the oxygen-enriched combustion boiler system emphatically controls the content of water vapor in recycling smoke and the circulation ratio of the recycling smoke and independently adjusts the oxygen injection ratios and amounts of the primary air and the secondary air. The oxygen-enriched combustion boiler system is environment-friendly and easy to implement, and has both oxygen injection safety and economy performances.
Description
Technical field
The present invention relates to a kind of boiler, especially a kind of oxygen-enriched combustion boiler system and its operation method.
Background technology
Carbon dioxide leads to one of major reason of global warming because having greenhouse effect and being generally considered.Fossil
Utilization of energy is most important co2Emission source, if Global Emissions of Greenhouse Gas amount is pressed industry statistic, power industry is maximum
Emission source, and coal fired power generation is co in power industry2The main source of discharge, oxygen-enriched combusting is a kind of for fossil combustion
The co that material generates electricity2Reduce discharging solution.
Oxygen-enriched combusting mode is in existing station boiler system-based, replaces routine with the gas containing high-concentration oxygen
Combustion air, obtains the co rich in more than 80% volumetric concentration simultaneously by flue gas recirculation2Flue gas, by further cold
Solidifying compression after purification, realizes co2Forever seal up for safekeeping or recycling a kind of combustion system.This new combustion mode is with now
There is power station combustion system to have good connection in technology, be relatively easy to realize large-scale co2Enrichment and reduction of discharging, also easily
Accepted by power industry.Being mainly characterized by of this combustion system adopts flue gas recirculation, with the co in flue gas2Substitute combustion-supporting sky
Nitrogen in gas, is participated in burning together with oxygen, so can increase substantially the co in flue gas2Concentration, facilitates co2Utilization and place
Reason is it is expected to form a kind of eco-friendly generation mode of pollutant comprehensive discharge low " chimney-free ".Existing analysis shows,
Compare with other carbon acquisition modes, oxygen-enriched combustion technology is in cost of investment, operating cost, co2Reduce discharging cost, maximization and with existing
The aspects such as the compatibility of technology are had all to have superiority.
But occur in that problem below in oxygen-enriched combusting operation test: one is that nox concentration in flue gas can exceed country
Environmental emission standard, two is the corrosion aggravation to cigarette air channel, burner hearth, heating surface etc..First, oxygen-enriched combusting is due to being followed using flue gas again
Ring, can enrichment phenomenon with flue gas recirculation in the nox in circulating flue gas, arrange and can exceed state to nox concentration in the flue gas of air
Family's environmental emission standard, accordingly, it would be desirable to take necessary measure, prevents the generation of oxygen-enriched combusting flue gas middle and high concentration nox.
2nd, due to adopting flue gas recirculation, being enriched with also can occur oxygen-enriched combusting with flue gas recirculation in the sox in circulating flue gas
Phenomenon, thus producing corrosion to cigarette air channel, burner hearth, heating surface etc., needing to take necessary measure, preventing in flue gas recycled
Being significantly increased of sox concentration.
Content of the invention
The technical problem to be solved is to provide a kind of richness being capable of qualified discharge slowing device corrosion phenomenon
Oxygen combustion boiler system and its operation method.
Inventor note that oxygen-enriched combusting due to adopting flue gas recirculation, and nox, sox in circulating flue gas can follow with flue gas
Ring and enrichment phenomenon occurs, but this phenomenon is generally ignored: the boiler of power plant, gas cleaning and steam electrical generating unit with
Outward, conventional oxygen-enriched combusting electricity generation system increased the units such as air separation, flue gas condensing, flue gas compressor purification, but does not examine
Consider the process of nitrogen oxides and oxysulfide.
In order to oxysulfide, discharged nitrous oxides concentration under oxygen-enriched combusting operating mode are controlled in the reasonable scope, the present invention
Provide firstly a kind of oxygen-enriched combustion boiler system, it include burner hearth, burner, fire air nozzle, preheater, back-end ductwork,
Dust-precipitator and chimney, its flue gas recirculation pipeline includes denitrification apparatus, desulfurizer and gas cooler and follows to divide into
Put, between the heat release gas approach of the outlet of back-end ductwork and preheater, be connected with denitrification apparatus, the heat release flue gas of preheater goes out
Mouthful removing dust device is connected with the heat release gas approach of flue gas heat-exchange unit, the heat release exhanst gas outlet of flue gas heat-exchange unit and desulfurizer,
Gas cooler is sequentially connected rear tieback to the heat absorption gas approach of flue gas heat-exchange unit, and the First air of burner is through preheater
Rear portion sends into burner through First air oxygen infusion appliance, and, as powder wind processed, the secondary wind of burner is through secondary for remainder
Enter preheater after wind oxygen infusion appliance and be re-fed into burner.
The present invention passes through to arrange denitrification apparatus, the nox in removing flue gas on tail flue gas passage, prevents in flue gas
The problem being enriched with flue gas recirculation in nox, and in control flue gas recycled and discharge flue gas, nox concentration is in OK range；
Arrange desulfurizer 10, the sox in removing flue gas in tail flue gas passage, prevent the sox in flue gas from going out with flue gas recirculation
The problem being now enriched with, controls sox concentration in flue gas recycled and discharge flue gas in OK range, to prevent flue and heating surface acid
Corrosion, because flue gas is both needed to through smoke eliminator, especially after desulfurization process, water content may be up to 20%, adiabatic fire in stove
Flame temperature reduces, the steady combustion relative difficulty of burner, and therefore after desulfurization process device, setting gas cooler is carried out at eliminating water
Low water content flue gas is put into recirculation so that adiabatic flame temperature, inner flue gas of the stove flow etc. after reducing flue gas water content by reason again
Less with difference during air burning, increase combustion stability so that oxygen-enriched combusting is easier to realize in engineering.
At 300-420 DEG C, this temperature range is exactly in economizer and preheater in the optimal reaction temperature interval of scr denitration
Between, therefore denitrification apparatus are placed before being arranged in preheater and cleaner unit, because can take out of certain in wet-method desulfurized fume
Moisture, if before being arranged in cleaner unit, can lead to cleaner unit to glue stifled etc., thus by desulfurizer be placed on preheater and cleaner unit it
Afterwards.
Additionally, from security consideration, oxygen infusion appliance is preferably disposed on the relatively low position of flue-gas temperature, enter pre- in flue gas
Carry out before hot device, but under oxygen-enriched combusting mode, will be used as pulverized coal preparation system from First air preheater a part of hot blast out
Use wind it is not necessary to note oxygen, therefore, from take into account economy consider, select two note oxygen points respectively First air, secondary wind are carried out
Note oxygen, is also convenient for adjusting to First air, secondary wind respective note oxygen amount.First air, secondary wind are respectively by being arranged in recirculation
, in the ratio note oxygen setting, one, the two wind air distributions that as far as possible burn with coal dust regular air are close for oxygen infusion appliance on flue.
It is further that the heat absorption exhanst gas outlet of flue gas heat-exchange unit separates three outlet branch roads, and first outlet branch road is successively
Be connected with the secondary air inlet of burner through secondary wind oxygen infusion appliance and preheater, that is, secondary wind using cold end note oxygen by the way of,
After the preheated device of second outlet branch road, a point two-way is each connected with First air oxygen infusion appliance, pulverized coal preparation system, First air oxygen infusion appliance
Be connected with a wind inlet of burner through air and powder mixer, pulverized coal preparation system is connected with powder cabin, powder cabin respectively with air and powder mixer,
Fire air nozzle and dust-precipitator connect, and powder wind processed can send into burner hearth as burnout degree from after-flame air port after pulverized coal preparation system,
Chimney can be sent directly into as weary gas after gathering dust and processing to drain, the 3rd outlet branch road is connected to carbon dioxide compression through control valve
Purification devices or chimney, that is, treated but do not need enter flue gas recirculation the unnecessary flue gas of part can enter subsequent treatment
Or discharge, flue gas is both needed to through flue gas purification system, and the required exhaust gas volumn processing of flue gas purification system compares regular air burning
System only slightly decreases, and comparatively invests larger.But because the water content of circulating flue gas is relatively low, adiabatic flame temperature, stove
When interior flue gas flow etc. and air burning, difference is less, and combustion stability is preferable；Each air channel flow connects the most with during air burning
Closely, therefore Fan Selection is easier to relatively, and this system is minimum with regular air combustion system difference, thus is easier to reality in engineering
Existing.
On described first outlet branch road, set gradually the first flue gas control valve, suction between flue gas heat-exchange unit and preheater
Wind system, pressure fan and secondary wind oxygen infusion appliance, the first flue gas control valve is used for adjusting secondary air flow, and air draft system is used in sky
Air draught during gas burning is used, and pressure fan is originated for smoke power, and secondary wind oxygen infusion appliance is used for noting in the flue gas be used as secondary wind
Oxygen.
On described second outlet branch road, set gradually the second flue gas control valve, suction between flue gas heat-exchange unit and preheater
Wind system, primary air fan, the second flue gas control valve is used for adjusting primary air flow, and air draft system is used for the air draught in air burning
With primary air fan is originated for smoke power.
The two ends of the described gas cooler gas cooler being provided with cigarette subcooling control valve in parallel cuts out branch road, described
The gas approach of gas cooler be provided with front shut-off valve, after the exhanst gas outlet of described gas cooler is provided with shut-off valve,
Gas cooler close branch road node one between described front shut-off valve and desulfurizer, node two in the rear shut-off valve with
Between flue gas heat-exchange unit.During air burning operating mode, forward and backward shut-off valve cuts out, cigarette subcooling control valve is opened, and gas cooler is cut
Except running, during oxygen-enriched combusting operating mode, forward and backward shut-off valve is opened, cigarette subcooling control valve is closed, gas cooler puts into operation.
Be provided between described preheater and pulverized coal preparation system the 3rd flue gas control valve, preheater and First air oxygen infusion appliance it
Between be provided with and be provided with the 5th flue gas control valve between the 4th flue gas control valve, preheater and the secondary air inlet of burner, lead to
Cross the respective air quantity that above-mentioned flue gas controls valve regulation First air, secondary wind and powder wind processed.
It is provided with the 6th flue gas control valve, flue gas heat exchange between described flue gas heat-exchange unit and carbon dioxide compression purification devices
Device is connected with chimney through the 7th flue gas control valve, needs for unnecessary flue gas to make compression purification process or discharge according to operation.
It is divided into two-way, a road enters after preheater as two through secondary wind oxygen infusion appliance after the exhanst gas outlet of described cleaner unit
Secondary wind, another road enters gas cooler, extracts flue gas before desulphurization plant as secondary wind, circulating flue gas temperature is relatively
Height, up to 200 DEG C of 150-, can reduce heat loss due to exhaust gas to a certain extent, simultaneously because the minimizing of exhaust gas volumn, follow-up flue gas
The required exhaust gas volumn processing of cleaning system reduces, can be in the scale largely reducing this system, reduces cost；But due to
Circulating flue gas are processed without desulfurization dewatering, and water content may be up to 20%, and in stove, adiabatic flame temperature reduces, the steady combustion phase of burner
To difficulty.
It is divided into two-way, a road enters gas cooler, and another road is through secondary wind oxygen after the exhanst gas outlet of described desulfurizer
Infusion appliance enters after preheater as secondary wind, that is, also contemplate for extracting through desulfurization but the flue gas of non-eliminating water is as secondary wind.
Air port is set outside the fire air nozzle of described burner, this air port not air feed, powder system processed when pulverized coal preparation system runs
With this air port air feed when system is stopped transport.
Another technical problem to be solved by this invention is to provide one kind to be conducive to oxygen-enriched combustion boiler system stable operation
Oxygen-enriched combustion boiler system operation method, the circulating ratio of flue gas recycled controls 60%～95%, according to relevant test, is less than
Or during higher than this scope, be generally not easy to ensure the stability of burning, control the volume content of vapor in flue gas recycled to exist
Less than 7% it is contemplated that oxygen-enriched combusting formed rich co2Flue gas, after desulfurization, dedusting, temperature generally can be reduced to 50～
150 DEG C, if not being dried dehydration, its moisture may be up to more than 30%, especially in burning high sulfur coal, works as flue-gas temperature
So when being reduced to below dew point, in flue gas3、co2、h2O and alkaline earth element will form extremely strong corrosive acid mist, aggravation corrosion
Cigarette air channel, burner hearth, heating surface etc.；Additionally, using the flue gas of high-moisture as First air pulverized coal conveying when, easily cause airduct block
With powder cabin caking, the safe and stable operation of impact system, therefore, primarily control the water vapour content of flue gas recycled.
The note oxygen ratio of First air is 15%～25%, after note oxygen ratio=(oxygen amount in injection oxygen amount+former oxygen)/note oxygen
Exhaust gas volumn, described " measuring " is volume, and note oxygen ratio passes through phase in combine regulation oxygen infusion appliance and flue gas recirculation loop
The flue gas control valve answered is realizing it is therefore intended that making the First air after note oxygen as far as possible and regular air combustion conditions wind next time
Partial pressure of oxygen and actual transport in the design such as heating surface arrangement, lectotype selection close to it is ensured that the inheritability of technology, that is, being easy to boiler
With reference to existing air burning technology in row control.Additionally, First air generally also doubles as defeated powder wind, its note oxygen ratio is also unsuitable
Too high, to ensure safety.
The note oxygen ratio of secondary wind is 20%～35%, its note calculation of oxygen ratio, control method and effect with aforementioned
First air adjusts similar.The note oxygen ratio of secondary wind is suitably above First air, thus being conducive to improving combustion stability and rush
Enter after-flame.
When switching to oxygen-enriched combusting operating mode from air burning operating mode, to carry out successively " increasing injection oxygen, increasing circulation
Flue gas ratio and reduction total blast volume " three is adjusted to once adjust, and is switched from air burning operating mode by adjustment above twice
To oxygen-enriched combusting operating mode it is ensured that burning in air and gas system pressure, flow and stove in handoff procedure, heat transfer does not occur significantly to dislike
Change.
The invention has the beneficial effects as follows: arrange denitrating system and desulphurization system using in oxygen-enriched combustion boiler system, keep away
Exempt from oxygen-enriched combusting flue gas recirculation process sulphur oxide, enrichment in nitrogen oxides, caused flue gas recycled pipeline and be subject to
The problems such as corrosion of hot face and discharge sulfureous in flue gas oxide, nitrous oxides concentration are higher, makes oxysulfide, discharged nitrous oxides dense
Degree can be controlled in zone of reasonableness；Using after the heating of preheated device, do not note the fluid media (medium) as pulverized coal preparation system for the dry flue gas of oxygen, warp
First air after note oxygen is as coal dust pumped (conveying) medium, co in effective control boiler exhaust gas2Concentration enrichment to more than 80%, beneficial to coal
Co in flue gas after powder burning2Trapping；Oxygen is separately noted using First air, secondary wind, and note oxygen ratio is controlled in zone of reasonableness,
Secondary wind adopts low-temperature end to note oxygen, has taken into account oxygen-enriched combusting and has noted the uniformity of oxygen, safety.
Brief description
Fig. 1 is the composition schematic diagram of the oxygen-enriched combustion boiler system of the present invention.
Fig. 2 is that the note oxygen position (oxygen infusion appliance position in pipeline) of the present invention selects schematic diagram.
In figure is labeled as: burner hearth 1, burner 2, fire air nozzle 3, economizer 4, denitrification apparatus 5, preheater 6, cleaner unit
7th, air-introduced machine 8, flue gas heat-exchange unit 9, desulfurizer 10, front shut-off valve 11, gas cooler 12, cigarette subcooling control valve 13, rear shutoff
Valve 14, the 6th flue gas control valve 15, carbon dioxide compression purification devices 16, the first flue gas control valve 17, the second flue gas control valve
18th, air draft system 19, back-end ductwork 20, pressure fan 21, primary air fan 22, First air oxygen infusion appliance 23, secondary wind oxygen infusion appliance
24th, secondary wind 25, First air 26, powder processed wind 27, the 5th flue gas control valve 28, the 4th flue gas control valve 29, the 3rd flue gas control
Valve 30 processed, pulverized coal preparation system 31, air and powder mixer 32, powder cabin 33, dust-precipitator 34, chimney 35, the 7th flue gas control valve 36, heating surface
37th, heating surface 38, heating surface 39.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples.
As shown in Figure 1 and Figure 2, the oxygen-enriched combustion boiler system of the present invention include burner hearth 1, burner 2, fire air nozzle 3,
Preheater 6, back-end ductwork 20, dust-precipitator 34 and chimney 35, the heat release gas approach of the outlet of back-end ductwork 20 and preheater 6 it
Between be connected with denitrification apparatus 5, the heat release exhanst gas outlet removing dust device 7 of preheater 6 is with the heat release gas approach of flue gas heat-exchange unit 9 even
Connect, the heat release exhanst gas outlet of flue gas heat-exchange unit 9 and desulfurizer 10, gas cooler 12 are sequentially connected rear tieback to flue gas heat exchange
The heat absorption gas approach of device 9, the heat absorption exhanst gas outlet of flue gas heat-exchange unit 9 separates three outlet branch roads, and first outlet branch road is successively
It is connected with the secondary air inlet of burner 2 through secondary wind oxygen infusion appliance 24 and preheater 6, after the preheated device of second outlet branch road 6
Point two-way is each connected with First air oxygen infusion appliance 23, pulverized coal preparation system 31, First air oxygen infusion appliance 23 through air and powder mixer 32 and
Wind inlet of burner 2 connects, and pulverized coal preparation system 31 is connected with powder cabin 33, powder cabin 33 respectively with air and powder mixer 32, after-flame
Wind snout 3 and dust-precipitator 34 connect, and the 3rd outlet branch road is connected to carbon dioxide compression purification devices 16 or chimney through control valve
35, first outlet branch road and second outlet branch road are respectively arranged with the air draft system 19 before preheater 6.
Oxygen-enriched combusting method using above-mentioned oxygen-enriched combustion boiler system is: by pressure fan 21 and primary air fan 22, altogether
Extract 60%～90% neat stress from flue gas heat-exchange unit 9 neat stress exhaust pass.Circulating flue gas as secondary wind 25 pass through cloth
Put the secondary wind oxygen infusion appliance 24 in pressure fan 21 outlet to inject the oxygen of required 60%～80% that burns, and pass through secondary wind
Oxygen is mixed homogeneously by oxygen infusion appliance 24 with circulating flue gas, more preheated device 6 circulating flue gas are heated after deliver to burner 2；Warp
After circulating flue gas are heated by the preheated device of circulating flue gas 6 of primary air fan 22, it is divided into First air 26 and powder wind 27 processed, First air
The oxygen of required 10%～40% that burns is injected by 26 by the First air oxygen infusion appliance 23 being arranged on an air channel, First air
After 26 are mixed with coal dust in air and powder mixer 32, send into burner hearth 1 with secondary wind 25 through burner 2 and burn.The heat that burning produces
After flue gas passes sequentially through heating surfaces 37,38,39 at different levels, it is arranged at the nox that the denitrification apparatus 5 after economizer 4 remove in flue gas,
Pass sequentially through cleaner unit 7, air-introduced machine 8 again, after flue gas heat-exchange unit 9, enter double alkali method desulfurizing device 10 and remove so in flue gas2,
Neat stress after desulfurization removes the part moisture in flue gas by gas cooler 12 again, so that the moisture Control in neat stress is existed
Within 5%.As circulating flue gas, remainder delivers to carbon dioxide to 60%～90% of neat stress through gas cooler 12 dehumidifying
Compression purification devices 16 compress purification or enter air by chimney 35.Cleaner unit 7 adopts electric cleaner, and denitrification apparatus 5 adopt
Scr denitrification apparatus.
The oxygen-enriched combustion boiler system of the present invention, through the flue gas recycled after denitrification apparatus 5 denitration, desulfurizer 10 desulfurization
It is arranged at most of vapor that desulfurizer 10 gas cooler 12 below removes in flue gas, control in flue gas recycled
Within 4%～7%, the circulating ratio of flue gas recycled controls 70%～95% the content of vapor.
As shown in Fig. 2 the oxygen-enriched combustion boiler system of the present invention, First air 26, secondary wind 25 are passed through to be arranged in respectively again
Oxygen infusion appliance on cycle flue presses different proportion note oxygen.First air 26 adopts oxygen infusion appliance hot junction to note oxygen, and note oxygen ratio is 15%
～25%；Secondary wind 25 adopts oxygen infusion appliance cold end to note oxygen, and note oxygen ratio is 20%～35%.
As the oxygen-enriched combustion boiler system of the present invention of Fig. 1, controlled by controlling two air draft systems 19 and the first flue gas
Valve 17, the switch of the second flue gas control valve 18 and aperture, can smoothly can achieve air burning and oxygen-enriched combusting and two kinds of burnings
Switching between operating mode.During air burning operating mode, the first flue gas control valve 17, the second flue gas control valve 18 are closed, two air draft systems
19 unlatchings, directly take out air as burning and powder wind processed, and front shut-off valve 11, rear shut-off valve 14 are closed, cigarette subcooling control valve
13 unlatchings, cigarette cooler are excised and run.During oxygen-enriched combusting operating mode, two air draft systems 19 are closed, the first flue gas control valve 17,
Two flue gas control valves 18 are opened, and front shut-off valve 11, rear shut-off valve 14 are opened, cigarette subcooling control valve 13 is closed, gas cooler 12
Put into operation.
Embodiment:
As shown in Figure 1 and Figure 2, the oxygen-enriched combustion boiler system of the present invention include burner hearth 1, burner 2, fire air nozzle 3,
Economizer 4 is located in back-end ductwork 20, preheater 6, dust-precipitator 34 and chimney 35, the outlet of back-end ductwork 20 and preheater 6
It is connected with denitrification apparatus 5, the heat release exhanst gas outlet removing dust device 7 of preheater 6 and flue gas heat-exchange unit 9 between heat release gas approach
Heat release gas approach connects, after the heat release exhanst gas outlet of flue gas heat-exchange unit 9 and desulfurizer 10, gas cooler 12 are sequentially connected
Tieback to flue gas heat-exchange unit 9 heat absorption gas approach, the two ends of gas cooler 12 are in parallel to be provided with cigarette subcooling control valve 13
Gas cooler close branch road, before the gas approach of gas cooler 12 is provided with shut-off valve 11, in gas cooler 12
Exhanst gas outlet is provided with rear shut-off valve 14, gas cooler close the node one of branch road front shut-off valve 11 and desulfurizer 10 it
Between, between rear shut-off valve 14 and flue gas heat-exchange unit 9, the heat absorption exhanst gas outlet of flue gas heat-exchange unit 9 separates three outlets to node two
Branch road, first outlet branch road has the first flue gas control valve 17, air draft system 19, pressure fan 21, secondary wind oxygen infusion appliance 24 successively,
Preheated device 6 is connected with the secondary air inlet of burner 2, and second outlet branch road sets gradually the second flue gas control valve 18, air draught
System 19, primary air fan 22, after preheated device 6, a point two-way connects the 4th flue gas control valve 29, the 3rd flue gas control valve 30 respectively
Each it is connected with First air oxygen infusion appliance 23, pulverized coal preparation system 31 afterwards, First air oxygen infusion appliance 23 is through air and powder mixer 32 and burning
Wind inlet of device 2 connects, and pulverized coal preparation system 31 is connected with powder cabin 33, and powder cabin 33 is sprayed with air and powder mixer 32, burnout degree respectively
Mouth 3 and dust-precipitator 34 connect, and the 3rd outlet branch road is connected to carbon dioxide compression purification devices 16 through the 6th flue gas control valve 15
Or continue on through the 7th flue gas control valve 36 and be connected to chimney 35, cleaner unit 34 is connected with chimney 35.
The air burning operating mode of above-mentioned boiler:
First flue gas control valve 17, the second flue gas control valve 18 are closed, and two air draft systems 19 are opened, and directly take out
Air is as burning and powder processed wind wind regime, and front shut-off valve 11, rear shut-off valve 14 are closed, and cigarette subcooling control valve 13 is opened, will
Gas cooler 12 excision runs.The mill coal drying agent of pulverized coal preparation system 31 using the hot blast through preheater 6 i.e. powder processed wind 27,
Homoiothermic is carried out using cold wind；Pulverized coal preparation system adopts closed system, and weary gas 271 sends into burner hearth 1 as burner burnout degree.Powder feeding is adopted
With the First air 26 of preheater 6 heat out, with bypassing cold wind homoiothermic, air temperature of burner chooses 150～200 DEG C, combustion
Burner primary air ratio chooses 20%～30%, and First air speed chooses 20～25m/s.
The oxygen-enriched combusting operating mode of above-mentioned boiler:
Two air draft systems 19 are closed, and the first flue gas control valve 17, the second flue gas control valve 18 are opened, front shutoff
Valve 11, rear shut-off valve 14 are opened, and cigarette subcooling control valve 13 is closed, and gas cooler 12 runs.The mill of pulverized coal preparation system 31
Coal drier preheated using preheated device 6 after hot blast i.e. powder processed wind 27, homoiothermic is carried out using cold flue gas recycled；Powder system processed
System 31 adopts open system, and pulverized coal making system gas 27 is collected through dust-precipitator 34 and caused back-end ductwork 20 after coal dust and pass through chimney
35 enter air.First air 26 adopts high temperature to note oxygen, and air temperature of burner chooses 150-200 DEG C, burner primary air flow
Determine by the pulverized coal channel speed suitable with air burning operating mode and burner First air muzzle velocity, First air note oxygen ratio is
15-20%.Burner secondary wind adopts the hot secondary wind after preheated device 6 heating, adopts low temperature to note oxygen before preheater 6.By
Employ open system, burner fire air nozzle 3 outside setting air port, this air port when pulverized coal preparation system runs in pulverized coal preparation system 31
Not air feed, air feed when pulverized coal preparation system is stopped transport.
Air burning/oxygen-enriched combusting operating mode switching:
The oxygen-enriched combustion boiler system of the present invention as shown in Figure 1, both can achieve air burning, also can achieve oxygen-enriched combustion
Burn, air burning and richness can smoothly be realized by two air draft systems 19 and the first flue gas control valve 17, the second flue gas control valve 18
The switching of oxygen two kinds of combustion conditions of burning.For air burning mode, by adjusting the air door of pressure fan 21, air-introduced machine 8, that is, very
Easily realize air quantity and the regulation of burner hearth tiny structure；For oxygen-enriched combusting mode, in addition to reaching aforementioned final control targe,
For oxygen-enriched combusting close to full closeding state air and gas system, by select suitable air quantity, blast regulative mode, with rational
Distribution burner hearth and the pressure of smoke wind pipe, make the requirement of exerting oneself of air-introduced machine in handoff procedure excessively not increase, avoid burner hearth simultaneously
Pressure limit.The change procedure of major control variable when air burning operating mode is switched to oxygen-enriched combusting operating mode, including entrance stove
The air capacity of thorax, space division system oxygen-supplying amount and circulating flue gas flow, the flue gas flow discharged by chimney and one cycle cigarette
Coordination between the controlled quentity controlled variables such as throughput controls.For ensureing burning in air and gas system pressure, flow and stove in handoff procedure, heat transfer not
Occur significantly to deteriorate it should carry out the operation of " increase injection oxygen, increase circulating flue gas ratio and reduce total blast volume " successively,
Reach final operating mode switching target by operating for several times stage by stage.
Claims (14)
1. oxygen-enriched combustion boiler system, including burner hearth (1), burner (2), fire air nozzle (3), preheater (6), back-end ductwork
(20), dust-precipitator (34) and chimney (35), is characterized in that: its flue gas recirculation pipeline includes denitrification apparatus (5), desulfurizer
(10) and gas cooler (12) follow arranged below, the outlet of back-end ductwork (20) and the heat release flue gas of preheater (6) enter
It is connected with denitrification apparatus (5), heat release exhanst gas outlet removing dust device (7) of preheater (6) and putting of flue gas heat-exchange unit (9) between mouthful
Heat smoke import connects, and the heat release exhanst gas outlet of flue gas heat-exchange unit (9) is connected successively with desulfurizer (10), gas cooler (12)
Connect rear tieback to the heat absorption gas approach of flue gas heat-exchange unit (9), the First air (26) of burner (2) is after preheater (6)
A part sends into burner (2) through First air oxygen infusion appliance (23), remainder as powder processed with wind (27), burner (2)
Secondary wind (25) enters preheater (6) after secondary wind oxygen infusion appliance (24) and is re-fed into burner (2).
2. oxygen-enriched combustion boiler system as claimed in claim 1, is characterized in that: the heat absorption flue gas of described flue gas heat-exchange unit (9)
Outlet separates three outlet branch roads, and first outlet branch road is successively through secondary wind oxygen infusion appliance (24) and preheater (6) and burner
(2) secondary air inlet connects, the preheated device of second outlet branch road (6) divides two-way each afterwards and First air oxygen infusion appliance (23),
Pulverized coal preparation system (31) connects, and a wind inlet through air and powder mixer (32) and burner (2) for First air oxygen infusion appliance (23) connects
Connect, pulverized coal preparation system (31) is connected with powder cabin (33), powder cabin (33) respectively with air and powder mixer (32), fire air nozzle (3) and receive
Dirt device (34) connects, and the 3rd outlet branch road is connected to carbon dioxide compression purification devices (16) or chimney (35) through control valve, the
Air draft system (19) before preheater (6) is respectively arranged with one outlet branch road and second outlet branch road.
3. oxygen-enriched combustion boiler system as claimed in claim 2, is characterized in that: on described first outlet branch road, changes in flue gas
The first flue gas control valve (17), air draft system (19), pressure fan (21) and two is set gradually between hot device (9) and preheater (6)
Secondary wind oxygen infusion appliance (24).
4. oxygen-enriched combustion boiler system as claimed in claim 2, is characterized in that: on described second outlet branch road, changes in flue gas
The second flue gas control valve (18), air draft system (19), primary air fan (22) is set gradually between hot device (9) and preheater (6).
5. oxygen-enriched combustion boiler system as claimed in claim 2, is characterized in that: the two ends of described gas cooler (12) are in parallel
The gas cooler being provided with cigarette subcooling control valve (13) cuts out branch road, in the gas approach setting of described gas cooler (12)
There is front shut-off valve (11), the exhanst gas outlet of described gas cooler (12) is provided with rear shut-off valve (14), gas cooler closes
The node one closing branch road between described front shut-off valve (11) and desulfurizer (10), node two in the rear shut-off valve (14) with
Between flue gas heat-exchange unit (9).
6. oxygen-enriched combustion boiler system as claimed in claim 2, is characterized in that: described preheater (6) and pulverized coal preparation system (31)
Between be provided with and be provided with the 4th flue gas between the 3rd flue gas control valve (30), preheater (6) and First air oxygen infusion appliance (23)
It is provided with the 5th flue gas control valve (28) between the secondary air inlet of control valve (29), preheater (6) and burner (2).
7. oxygen-enriched combustion boiler system as claimed in claim 2, is characterized in that: described flue gas heat-exchange unit (9) and carbon dioxide
It is provided with the 6th flue gas control valve (15), flue gas heat-exchange unit (9) is through the 7th flue gas control valve between compression purification devices (16)
(36) it is connected with chimney (35).
8. oxygen-enriched combustion boiler system as claimed in claim 1, is characterized in that: divides after the exhanst gas outlet of described cleaner unit (7)
For two-way, a road enters as secondary wind (25) after preheater (6) through secondary wind oxygen infusion appliance (24), and another road entrance flue gas is cold
But device (12).
9. oxygen-enriched combustion boiler system as claimed in claim 1, is characterized in that: after the exhanst gas outlet of described desulfurizer (10)
It is divided into two-way, a road enters gas cooler (12), another road enters conduct after preheater (6) through secondary wind oxygen infusion appliance (24)
Secondary wind (25).
10. oxygen-enriched combustion boiler system as claimed in claim 1, is characterized in that: the fire air nozzle of described burner (2)
(3) air port is set outside.
The operation method of oxygen-enriched combustion boiler system as described in any one claim in 11. such as claim 1～10, its feature
Be: the circulating ratio of flue gas recycled controls 60%～95%, control the volume content of vapor in flue gas recycled 7% with
Under.
The operation method of oxygen-enriched combustion boiler system as described in any one claim in 12. such as claim 1～10, its feature
It is: the note oxygen ratio of First air is 15%～25%.
The operation method of oxygen-enriched combustion boiler system as described in any one claim in 13. such as claim 1～10, its feature
It is: the note oxygen ratio of secondary wind is 20%～35%.
The operation method of oxygen-enriched combustion boiler system as described in any one claim in 14. such as claim 1～10, its feature
It is: when switching to oxygen-enriched combusting operating mode from air burning operating mode, to carry out successively increasing injection oxygen, to increase circulating flue gas ratio
Example and reduction total blast volume three are adjusted to once adjust, and switch to oxygen-enriched combustion by adjustment above twice from air burning operating mode
Burn operating mode.
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